Stormwater Engineering

Stormwater rational method peak discharge calculator

Stormwater rational method peak discharge engineering calculator. Formula: peak_discharge = runoff_coefficient * rainfall_intensity * catchment_area.

Quick Answer

Calculate Stormwater rational method peak discharge

Calculator

Peak discharge (m³/s)
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Result Interpretation

The result shows Peak discharge in m³/s, computed directly from the entered inputs using the formula defined for this tool.

Worked Example

Verified calculation

Given:

  • runoff_coefficient = 0.8
  • rainfall_intensity = 50
  • catchment_area = 10

Expected Result:

  • peak_discharge = 400

The actual numerical result is computed by the Runtime engine using the persisted tool definition. The values shown here come from automatically validated test cases.

Formula / Method

peak_discharge = runoff_coefficient * rainfall_intensity * catchment_area

Formula family: formula_sw_rational_discharge

Variables

SymbolLabelRoleDescription
runoff_coefficient Runoff coefficient INPUT Runoff coefficient
rainfall_intensity Rainfall intensity INPUT Rainfall intensity
catchment_area Catchment area INPUT Catchment area
peak_discharge Peak discharge OUTPUT Peak discharge

Calculation Steps

  1. Enter the runoff coefficient in ratio.
  2. Enter the rainfall intensity in mm/h.
  3. Enter the catchment area in ha.
  4. Step 1: Compute peak discharge.
  5. Read the peak discharge (m³/s) from the results.

Engineering Summary

Calculate Stormwater rational method peak discharge The calculation uses Direct formula — peak_discharge = runoff_coefficient * rainfall_intensity * catchment_area. This tool is applicable in stormwater.toolfusion.net.

Notes / Limitations

  • ASSUMPTION
  • ASSUMPTION

Frequently Asked Questions

What does this calculator calculate?

The Stormwater rational method peak discharge calculator estimates Peak discharge based on the input parameters you provide

What units should I use for the inputs?

Enter each value in the units shown next to the input field: Runoff coefficient (ratio), Rainfall intensity (mm/h), Catchment area (ha). Make sure all inputs use the specified units for consistent results

How does Runoff coefficient affect the results?

The runoff coefficient directly affects: Peak discharge. Increasing or decreasing this value will change these output values according to the engineering formula

How should I interpret the calculated results?

The calculator provides the following outputs: peak discharge in m³/s. Results are computed from the input values using the defined calculation method. Always verify results against project-specific requirements and applicable standards

What assumptions does this calculator use?

This calculator uses automatically validated engineering formulas; the calculation method is based on Direct formula peak_discharge = runoff_coefficient * rainfall_intensity * catchment_area. Results are approximate and should be validated against site-specific conditions, applicable codes, and professional engineering judgment

When is this calculation useful?

The Stormwater rational method peak discharge calculator is useful during preliminary design, feasibility studies, and quick engineering checks in stormwater.toolfusion.net projects. It helps engineers and designers estimate key parameters before proceeding with detailed analysis

Technical Details
Assumption
Assumption

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